A.F.X. Mega G for me too, in fact it's on a smaller layout that they come into their own I feel. Best looking bodies too and available in frankly amazing value sets with the best track system too.
X-tractions and the like are fun.
I too have a lot of time for Micro Scalextric and Lifelike M chassis but the appeal of the former is diminished when not racing on it's own track system (without modification) and the latter is no longer in production.
All that said I enjoy all of the above at home as do my children, happy racing.